Cool_Tools/bemaniutils
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Fix partial-alpha blending equation, should fix dark sprites on semi-transparent backgrounds.

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This commit is contained in:
Jennifer Taylor 2021-05-16 22:19:38 +00:00
parent 40968ab039
commit ace6bd54c4
1 changed files with 6 additions and 5 deletions
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11
bemani/format/afp/blend.py
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@ -41,12 +41,13 @@ def blend_normal(
# Calculate alpha blending.
srcpercent = src[3] / 255.0
destpercent = dest[3] / 255.0
destremainder = 1.0 - srcpercent
srcremaineder = 1.0 - srcpercent
new_alpha = (srcpercent + destpercent * srcremaineder)
return (
clamp((dest[0] * destpercent * destremainder) + (src[0] * srcpercent)),
clamp((dest[1] * destpercent * destremainder) + (src[1] * srcpercent)),
clamp((dest[2] * destpercent * destremainder) + (src[2] * srcpercent)),
clamp(255 * (srcpercent + destpercent * destremainder)),
clamp(((dest[0] * destpercent * srcremaineder) + (src[0] * srcpercent)) / new_alpha),
clamp(((dest[1] * destpercent * srcremaineder) + (src[1] * srcpercent)) / new_alpha),
clamp(((dest[2] * destpercent * srcremaineder) + (src[2] * srcpercent)) / new_alpha),
clamp(255 * new_alpha)
)